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Modeling the effect of wetting on the mechanical behavior of crushable granular materials 被引量:1
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作者 Carlos Ovalle Pierre-Yves Hicher 《Geoscience Frontiers》 SCIE CAS CSCD 2020年第2期487-494,共8页
It is well known that the compressibility of crushable granular materials increases with the moisture content,due to the decrease of particle strength in a humid environment.An existing approach to take into account t... It is well known that the compressibility of crushable granular materials increases with the moisture content,due to the decrease of particle strength in a humid environment.An existing approach to take into account the effect of grain breakage in constitutive modeling consists in linking the evolution of the grain size distribution to the plastic work.But how the material humidity can affect this relationship is not clear,and experimental evidence is quite scarce.Based on compression tests on dry and saturated crushable sand recently reported by the present authors,a new non-linear relationship is proposed between the amount of particle breakage and the plastic work.The expression contains two parameters:(1)a material constant dependent on the grain characteristics and(2)a constant depending on the wetting condition(in this study,dry or saturated).A key finding is that the relationship does not depend on the stress path and,for a given wetting condition,only one set of parameters is necessary to reproduce the results of isotropic,oedometric,and triaxial compression tests.The relationship has been introduced into an elastoplastic constitutive model based on the critical state concept with a double yield surface for plastic sliding and compression.The breakage ratio is introduced into the expression of the elastic stiffness,the critical state line and the hardening compression pressure.Incremental stress-strain computations with the model allow the plastic work to be calculated and,therefore,the evolution of particle crushing can be predicted through the proposed non-linear relationship and reintroduced into the constitutive equations.Accurate predictions of the experimental results in terms of both stress-strain relationships and breakage ratio were obtained. 展开更多
关键词 Grain crushing WETTING Constitutive modeling
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Incorporating mitigation strategies in machine learning for landslide susceptibility prediction
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作者 Hai-Min Lyu Zhen-Yu Yin +1 位作者 Pierre-Yves Hicher Farid Laouafa 《Geoscience Frontiers》 SCIE CAS CSCD 2024年第5期399-414,共16页
This study proposes an approach that considers mitigation strategies in predicting landslide susceptibility through machine learning(ML)and geographic information system(GIS)techniques.ML models,such as random forest(... This study proposes an approach that considers mitigation strategies in predicting landslide susceptibility through machine learning(ML)and geographic information system(GIS)techniques.ML models,such as random forest(RF),logistic regression(LR),and support vector classification(SVC)are incorporated into GIS to predict landslide susceptibilities in Hong Kong.To consider the effect of mitigation strategies on landslide susceptibility,non-landslide samples were produced in the upgraded area and added to randomly created samples to serve as ML models in training datasets.Two scenarios were created to compare and demonstrate the efficiency of the proposed approach;Scenario I does not considering landslide control while Scenario II considers mitigation strategies for landslide control.The largest landslide susceptibilities are 0.967(from RF),followed by 0.936(from LR)and 0.902(from SVC)in Scenario II;in Scenario I,they are 0.986(from RF),0.955(from LR)and 0.947(from SVC).This proves that the ML models considering mitigation strategies can decrease the current landslide susceptibilities.The comparison between the different ML models shows that RF performed better than LR and SVC,and provides the best prediction of the spatial distribution of landslide susceptibilities. 展开更多
关键词 Machine learning Landslide susceptibility Spatial prediction Mitigation strategies
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工艺参数对激光熔覆成形316L不锈钢形状的影响规律 被引量:14
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作者 黄小伟 习俊通 +2 位作者 J. L. Lebrun Elcheikh Hussam Courant Bruno 《激光与光电子学进展》 CSCD 北大核心 2011年第7期114-119,共6页
激光熔覆技术经多年发展已取得许多成功的工业应用,但如何控制工艺以达到最佳成形效果,需要通过研究工艺参数与成形精度之间的关系才能找到最终的解决方案。借助激光熔覆快速成形法制备316L不锈钢实验试样,研究工艺参数组合对成形试样... 激光熔覆技术经多年发展已取得许多成功的工业应用,但如何控制工艺以达到最佳成形效果,需要通过研究工艺参数与成形精度之间的关系才能找到最终的解决方案。借助激光熔覆快速成形法制备316L不锈钢实验试样,研究工艺参数组合对成形试样形状的影响规律。通过定义单涂覆层截面形状特征参数,采用线性相关法处理截面形状数据,建立工艺参数组合与截面形状特征参数的线性关系。此外,激光熔覆成形件易出现两类典型缺陷,即晶界间微裂纹和层间熔合不良缺陷。 展开更多
关键词 激光技术 激光熔覆成形 形状特性 线性相关
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A Multi-Material CCALE-MOF Approach in Cylindrical Geometry 被引量:2
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作者 Marie Billaud Friess Jerome Breil +1 位作者 Pierre-Henri Maire Mikhail Shashkov 《Communications in Computational Physics》 SCIE 2014年第2期330-364,共35页
In this paper we present recent developments concerning a Cell-Centered Arbitrary Lagrangian Eulerian(CCALE)strategy using the Moment Of Fluid(MOF)interface reconstruction for the numerical simulation of multi-materia... In this paper we present recent developments concerning a Cell-Centered Arbitrary Lagrangian Eulerian(CCALE)strategy using the Moment Of Fluid(MOF)interface reconstruction for the numerical simulation of multi-material compressible fluid flows on unstructured grids in cylindrical geometries.Especially,our attention is focused here on the following points.First,we propose a new formulation of the scheme used during the Lagrangian phase in the particular case of axisymmetric geometries.Then,the MOF method is considered for multi-interface reconstruction in cylindrical geometry.Subsequently,a method devoted to the rezoning of polar meshes is detailed.Finally,a generalization of the hybrid remapping to cylindrical geometries is presented.These explorations are validated by mean of several test cases using unstructured grid that clearly illustrate the robustness and accuracy of the new method. 展开更多
关键词 Cell-centered scheme Lagrangian hydrodynamics ALE MOF interface reconstruction Rezoning algorithm polar meshes hybrid remapping axisymmetric geometries.
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Influence of natural deposition plane orientation on oedometric consolidation behavior of three typical clays from southeast coast of China
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作者 Qi-yin ZHU Yin-fu JIN +1 位作者 Zhen-yu YIN Pierre-Yves HICHER 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2013年第11期767-777,共11页
The parameters obtained from oedometric consolidation tests are commonly used in the development of constitutive modeling and for engineering practice. This paper focuses on the influence of the natural deposition pla... The parameters obtained from oedometric consolidation tests are commonly used in the development of constitutive modeling and for engineering practice. This paper focuses on the influence of the natural deposition plane orientation on oedometric consolidation behavior of three natural clays from the southeast coast of China. Oedometer tests were conducted on intact specimens prepared by sampling at a series of angles relative to the natural deposition plane. For each specimen, yield stress,compressibility indexes, secondary compression, and permeability coefficients were determined. The influence of the sampling angle on these properties was investigated, revealing that yield stress, compression index, swelling index, creep index, ratio of secondary compression coefficient to compression index(Cae/Cc) and permeability coefficient were all dependent to some extent on the sampling angle. These findings indicate the role of the anisotropy due to the natural deposition on the oedometric consolidation behavior. 展开更多
关键词 CLAY COMPRESSIBILITY CONSOLIDATION Creep Permeability Natural deposition
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Inverse methodology as applied to reconstruct local textile features from measured pressure field
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作者 S.Bancora C.Binetruy +1 位作者 S.Advani Comas-Cardona 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2021年第12期241-247,共7页
One can compute the final deformation of a known geometry under specific boundary conditions using the constitutive laws of mechanics that describe their stress strain behavior.In such cases the initial geometry is kn... One can compute the final deformation of a known geometry under specific boundary conditions using the constitutive laws of mechanics that describe their stress strain behavior.In such cases the initial geometry is known,and all operators mapping the deformation are defined on the reference domain.However,there are situations in which the final configuration of a deformation might be known but not the initial.The inverse formulation allows one to determine the initial geometry of a domain,given its final deformation state,the material behavior law and a set of boundary conditions.In the present work we propose a method to reconstruct the mesoscale geometry of a textile based on its mechanical response during compaction.To do so,stress boundary conditions are acquired by means of a pressuresensitive film.By adopting an appropriate material law,the thickness and width information of the yarns are deduced from the pressure field experienced by the compacted textile.Unlike 3 D scanning techniques such as-CT,the proposed method can be applied on any domain size,allowing long-range variability to be captured.To the best of the authors’knowledge,there are no previous works that use a pressure-sensitive film on a large domain to capture the input data for a shape reconstruction.This example application serves as a demonstration of a methodology which could be applied to other classes of materials. 展开更多
关键词 TEXTILES Pressure sensors Inverse method Digital twin Geometry reconstruction HYPERELASTICITY
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